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Information content of the non-linear matter power spectrum

ColdThunder 添加于 2010-8-31 15:49 | 1872 次阅读 | 0 个评论

作者
Rimes CD, Hamilton AJS
摘要
We use an ensemble of N-body simulations of the currently favoured (concordance) cosmological model to measure the amount of information contained in the non-linear matter power spectrum about the amplitude of the initial power spectrum. Two surprising results emerge from this study: (i) that there is very little independent information in the power spectrum in the translinear regime (k ~ 0.2-0.8 Mpc/h at the present day) over and above the information at linear scales and (ii) that the cumulative information begins to rise sharply again with increasing wavenumber in the non-linear regime. In the fully non-linear regime, the simulations are consistent with no loss of information during translinear and non-linear evolution. If this is indeed the case then the results suggest a picture in which translinear collapse is very rapid, and is followed by a bounce prior to virialization, impelling a wholesale revision of the HKLM-PD formalism.
详细资料
- 关键词: astro-ph
- 文献种类:期刊
- 地址: Rimes: JILA, University of Colorado at Boulder; Hamilton: JILA, University of Colorado at Boulder
- 备注:arXiv:astro-ph/0502081v3; 5 pages, 3 figures. Accepted to Monthly Notices of the Royal Astronomical Society Letters. Revised to match accepted version
标签

Fisher information power spectrum
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